Investment casting of AZ91HP magnesium alloy

Kim, Shae-Kwang; Kim, Myounggyun; Hong, Tae-Whan; Kim, Hee‐Kook; Kim, Young‐Jig

doi:10.1007/bf03028223

Cited by 22 publications

(11 citation statements)

References 6 publications

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“…Here, RE represents the total amounts of RE elements present in the alloy via mischmetal addition. Appropriate amounts of raw materials were melted in an induction furnace under the protection of CO 2 – 5% SF 6 gas [23] – and poured at a temperature of ∼ 730°C into a cylindrical permanent mould as shown in Figure 2(a) (length of 45 mm and outer and inner diameters of 40 and 34 mm, respectively). After homogenisation at 450°C for 5 h, the extrusion process was performed at 400°C with a ratio of 18:1 (Figure 2(b)), followed by air cooling to room temperature.…”

Section: Methodsmentioning

confidence: 99%

Enhanced mechanical properties of Mg–Ni–xRE alloys via hot extrusion

Moghadam

Malekan

Emamy

et al. 2021

Materials Science and Technology

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The effects of mischmetal addition and hot working on the enhancement of microstructure and mechanical properties of Mg–Ni alloys were studied. It was revealed that grain refinement could be achieved by introducing rare earth (RE) elements in the as-cast condition, and more pronouncedly, by the extrusion process in the wrought condition. While the formation of intergranular brittle phases via RE addition impaired the as-cast mechanical properties, the remarkable grain refinement and fragmentation and dispersion of intermetallic particles significantly improved the mechanical properties in the extruded condition. The ultimate tensile strength and total elongation of the extruded Mg–1.5Ni–3RE alloy with an average grain size of 3.18 μm (347 MPa and 9%) were much larger than those for the as-cast counterpart (140 MPa and 3%).

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Section: Methodsmentioning

confidence: 99%

Enhanced mechanical properties of Mg–Ni–xRE alloys via hot extrusion

Moghadam

Malekan

Emamy

et al. 2021

Materials Science and Technology

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“…In any case, the high reactivity of liquid magnesium needs specific liquefying and casting forms just as specific trim materials. [4] Investment casting process, otherwise called lost-wax process, is used when intricate detail, undermines or nonmachinable highlights and precise parts are wanted. It starts with a wax pattern which is an accurate copy of the as-cast part.…”

Section: Introductionmentioning

confidence: 99%

Investment casting process parameter selection by Weighted Sum Method

2020

JEMM

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Investment casting a known mechanical process relied on lost wax casting, the most known metal-framing strategies. The expression "lost-wax casting" can likewise allude to present day investment casting processes. The Investment casting have been used in different structures throughout previous 5,000 years. This was trailed by hundreds of years of utilization of gems and artistic items previously the approach of the Second World War used for the advancement of aviation and hence engineering segments. In this paper we have tried to optimise the parameters of investment casting using weight sum model method using input parameters as injection time, injection pressure and injection temperature. In order to optimise surface finish and shrinkage in process of mould making as it is crucial part of the whole manufacturing process to get perfect cast.

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“…The application of various face-coat oxides Al 2 O 3 , Y 2 O 3 , MgO etc. were observed as significant for suppressing the reactions to some extent [5][6][7][8][9]. The effectiveness of various protective gases to inhibit reactions and oxidation of Mg AZ91 melt were studied by many researchers.…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Vyas,

Sutaria

2020

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The magnesium alloy investment castings have greater potential for automobile and air-craft applications due to the higher strength to weight ratio of magnesium alloys and capability of the investment casting process to produce near net shape complex castings. The interfacial-mould metal reactions during investment casting of magnesium alloy inhibit successful production of quality castings. This paper presents the investigation done on the reactions at corners of AZ91 magnesium alloy cast part produced through investment casting. The stepped shape geometry of casting was selected to study the reactions at convex and concave corners of the cast part. The reacted surfaces were characterised using the SEM-EDX and XRD. The formation of oxides was observed on cast surface from characterisation. The temperature profile recorded at corners were helpful to understand the heat dissipation during the solidification of metal at corners. It was observed that the reactions occurred at the concave corner were more as compared to the convex corner of the cast part.

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Investment casting of AZ91HP magnesium alloy

Cited by 22 publications

References 6 publications

Enhanced mechanical properties of Mg–Ni–xRE alloys via hot extrusion

Enhanced mechanical properties of Mg–Ni–xRE alloys via hot extrusion

Investment casting process parameter selection by Weighted Sum Method

Archives of Foundry Engineering

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